Add decryptMime and refactor package structure

key/key.go

@@ -0,0 +1,78 @@
+package key
+
+import (
+	"strings"
+	"golang.org/x/crypto/openpgp"
+	"fmt"
+	"golang.org/x/crypto/openpgp/packet"
+	"bytes"
+	"proton/pmcrypto/armor"
+)
+
+//CheckPassphrase check is private key passphrase ok
+func CheckPassphrase(privateKey string, passphrase string) bool {
+	privKeyReader := strings.NewReader(privateKey)
+	entries, err := openpgp.ReadArmoredKeyRing(privKeyReader)
+	if err != nil {
+		fmt.Println(err)
+		return false
+	}
+
+	var keys []*packet.PrivateKey
+
+	for _, e := range entries {
+		keys = append(keys, e.PrivateKey)
+	}
+	var decryptError error
+	var n int
+	for _, key := range keys {
+		if !key.Encrypted {
+			continue // Key already decrypted
+		}
+		if decryptError = key.Decrypt([]byte(passphrase)); decryptError == nil {
+			n++
+		}
+	}
+	if n == 0 {
+		return false
+	}
+	return true
+}
+
+
+// PublicKey get a public key from a private key
+func PublicKey(privateKey string) (string, error) {
+	privKeyReader := strings.NewReader(privateKey)
+	entries, err := openpgp.ReadArmoredKeyRing(privKeyReader)
+	if err != nil {
+		return "", err
+	}
+
+	var outBuf bytes.Buffer
+	for _, e := range entries {
+		e.Serialize(&outBuf)
+	}
+
+	outString, err := armor.ArmorWithType(outBuf.Bytes(), armor.PUBLIC_KEY_HEADER)
+	if err != nil {
+		return "", nil
+	}
+
+	return outString, nil
+}
+
+// PublicKeyBinOut get a public key from a private key
+func PublicKeyBinOut(privateKey string) ([]byte, error) {
+	privKeyReader := strings.NewReader(privateKey)
+	entries, err := openpgp.ReadArmoredKeyRing(privKeyReader)
+	if err != nil {
+		return nil, err
+	}
+
+	var outBuf bytes.Buffer
+	for _, e := range entries {
+		e.Serialize(&outBuf)
+	}
+
+	return outBuf.Bytes(), nil
+}